I have ridden both. I feel the SkiDoo takes more, FOR ME, to get used to than the Polaris and AC chassis.
They have a different center of gravity and balance.
After riding the Doo for a while and gettting back onto the AC or Pol, I over-rode them. They took less effort to carve and boondock than the XP. I feel I can body steer the ProRMK better than any sled I've ridden.
When carving the Doo I kept having the inside ski bite down too hard and couldn't do it nice and smooth. I kept dipping and biting and it wasn't as easy for me to carve.
Got back on the AC and Pols and had a much smoother carving and sidehilling experience.
With that being said...that's just me and what I'm used to.
And my sled is a 2001 Pol GenII mod that doesn't handle like any of the new sleds.